“We have seen very similar copies before but we have never seen a shoe that perfectly copied,” Jan-Hendrik Schlottmann, chief executive officer of Derek Lam, told WWD. The shoe in question, a $150 Cadie wedge from the Ivanka Trump Footwear Collection, is said to be knock-off of Lam’s $780 “Ayami” design (for a side by side comparison, click here.)

“The Lam wedge sandals are of a popular design type that has been used by numerous manufacturers for many decades,” the company says in a statement. “There is nothing iconic about the appearance of the Lam sandal.”

As for Lam’s lawyer’s insistence that Trump’s Cadie wedge “mimic each unique design detail,” the licensee says there are discernible differences. “The Ivanka Trump sandals prominently display the Ivanka Trump name, and there can be no confusion as to the source of the Ivanka Trump sandals.”

The designer has reportedly given Trump seven business days to pull the shoe off the market.

When reached on Thursday, representatives for Derek Lam said they are “no longer commenting on this matter.”